Hello list,
I know that there was a posting to the list covering the exact topic but I am
still unable to read a small subset from a huge image.
The JP2k image is 114500 x 28820 pixels in size and it is tiled. the tiles have
the dimension 15000 x 15000 (!).
my first attempt was to read one tile with JAI only:
---
FileImageInputStream fiis = null;
try{
fiis = new FileImageInputStream(file);
}catch (Exception e) {
e.printStackTrace();
}
ImageReader ir =
getImageReaderForFileImageInputStreamFromOperationRegistry(fiis);
// Reader is
// com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReaderSpi
//Setting Area of Interest 512 x 512 Pixels
Rectangle roi = new Rectangle(1400, 200, 512, 512);
// Setting Read parameter
J2KImageReadParam rp = new J2KImageReadParam();
rp.setSourceRegion(roi);
JAI jai = JAI.getDefaultInstance();
//setting cache
TileCache cache = jai.getTileCache();
long size = 512*1024*1024L;
cache.setMemoryCapacity(size);
JAI.setDefaultTileSize(new Dimension(512, 512));
//ParameterBlock for Reading
ParameterBlockJAI pb = new ParameterBlockJAI(new ImageReadDescriptor());
pb.set(fiis, 0);
pb.set(0, 1);
pb.set(false, 2);
pb.set(false, 3);
pb.set(true, 4);
pb.set(null, 5);
pb.set(null, 6);
pb.set(rp, 7);
pb.set(ir, 8);
//setting source file
Vector<Object> vec = new Vector<Object>();
vec.add(fiis);
//setting ImageLayout to use smaller tiles
ImageLayout layout = new ImageLayout();
layout.setTileGridXOffset(0);
layout.setTileGridYOffset(0);
layout.setTileWidth(512);
layout.setTileHeight(512);
//Rendering Hints for the image Layout
RenderingHints rh = new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout);
// finally, create the PlanarImage
PlanarImage pi = JAI.create("ImageRead", pb, rh);
// trying to receive the subset
Raster rst = null;
try{
rst = pi.getData();
wrst = rst.createCompatibleWritableRaster();
}catch (Exception e) {
e.printStackTrace();
}
---
At the line
"rst = pi.getData();"
the program virtually stops. It computes for about 4 minutes and then returns
out of memory error:
---
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.eclipse.ve.internal.java.vce.launcher.remotevm.JavaBeansLauncher.main(JavaBeansLauncher.java:79)
Caused by: java.lang.OutOfMemoryError: Java heap space
at jj2000.j2k.image.DataBlkInt.<init>(DataBlkInt.java:97)
at
jj2000.j2k.wavelet.synthesis.InvWTFull.getInternCompData(InvWTFull.java:277)IWAV0052E
Invocation Target Exception creating com.haertelonline.test.JAItester
at jj2000.j2k.image.ImgDataConverter.getData(ImgDataConverter.java:249)
at
jj2000.j2k.image.ImgDataConverter.getInternCompData(ImgDataConverter.java:205)
at
jj2000.j2k.image.invcomptransf.InvCompTransf.getInternCompData(InvCompTransf.java:360)
at
com.sun.media.imageioimpl.plugins.jpeg2000.J2KReadState.readSubsampledRaster(J2KReadState.java:831)
at
com.sun.media.imageioimpl.plugins.jpeg2000.J2KReadState.readBufferedImage(J2KReadState.java:384)
at
com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReader.read(J2KImageReader.java:454)
at
com.sun.media.jai.imageioimpl.ImageReadOpImage.computeTile(ImageReadOpImage.java:697)
at
com.sun.media.jai.util.SunTileScheduler.scheduleTile(SunTileScheduler.java:914)
at javax.media.jai.OpImage.getTile(OpImage.java:1138)
at javax.media.jai.PlanarImage.getData(PlanarImage.java:2085)
at javax.media.jai.PlanarImage.getData(PlanarImage.java:2016)
at javax.media.jai.RenderedOp.getData(RenderedOp.java:2266)
at com.haertelonline.test.JAItester.main(JAItester.java:225)
... 5 more
I tried not to use cache, and omitting the rendering hints but it doesn't
change anything.
Because I read that geotools can do this better I started a second attempt:
---
ImageWorker iw = null;
try{
iw = new ImageWorker(file);
}catch (Exception e) {
e.printStackTrace();
}
result:
---
java.lang.IllegalArgumentException: Dimensions (width=114500 height=28820) are
too large
at java.awt.image.SampleModel.<init>(Unknown Source)
at java.awt.image.ComponentSampleModel.<init>(Unknown Source)
at java.awt.image.PixelInterleavedSampleModel.<init>(Unknown Source)
at
java.awt.image.PixelInterleavedSampleModel.createCompatibleSampleModel(Unknown
Source)
at
com.sun.media.imageioimpl.plugins.jpeg2000.J2KReadState.readBufferedImage(J2KReadState.java:371)
at
com.sun.media.imageioimpl.plugins.jpeg2000.J2KImageReader.read(J2KImageReader.java:454)
at javax.imageio.ImageIO.read(Unknown Source)
at javax.imageio.ImageIO.read(Unknown Source)
at org.geotools.image.ImageWorker.<init>(ImageWorker.java:172)
at com.haertelonline.test.GeoToolsTester.main(GeoToolsTester.java:196)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.eclipse.ve.internal.java.vce.launcher.remotevm.JavaBeansLauncher.main(JavaBeansLauncher.java:79)
---
OK, next attempt:
JP2KReader jp2r = null;
try{
jp2r = new JP2KReader(file);
}catch (Exception e) {
e.printStackTrace();
}
---
result is (line "jp2r = new JP2KReader(file)" was the problem):
org.geotools.data.DataSourceException: Unavailable envelope for this coverage
at
org.geotools.coverageio.jp2k.JP2KReader.setCoverageProperties(JP2KReader.java:157)
at org.geotools.coverageio.jp2k.JP2KReader.<init>(JP2KReader.java:523)
at org.geotools.coverageio.jp2k.JP2KReader.<init>(JP2KReader.java:120)
at com.haertelonline.test.GeoToolsTester.main(GeoToolsTester.java:212)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.eclipse.ve.internal.java.vce.launcher.remotevm.JavaBeansLauncher.main(JavaBeansLauncher.java:79)
---
Dear list, can someone please tell me how those images can be read? The images
I want to read are on the "ESRI DATA & MAPS CD".
One more general question: What happens under the hood when trying to read
packed (LZW/RLE/Packbits/) images. How can the program find out at which byte
position of a stream a specific pixel coordinate is located?
The tiles of the test image is 15000 x 15000, so there are 644MB RAM is needed
to load one tile in memory. I have 2GB Ram and the parameters -Xms1024m
-Xmx1024m are passed to the JVM when launching my small program. Does the "code
behind" JAI need to unpack the tiles first to find the roi I requested?
Thanks for any answer,
haerta
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